Az irídium izotópjai

Az irídiumnak (Ir) két természetes, és számos radioizotópja létezik, utóbbiak közül a legstabilabb az Ir-192. Ez az izotóp 73,83 nap felezési idővel béta-bomlás során platina-192-vé alakul, radioizotópjainak nagy része azonban ozmiumra bomlik.

Standard atomtömege: 192,217(3) u.

Táblázat

Az izotóp
jele
Z(p) N(n)  
Az izotóp tömege (u)
 
felezési idő magspin jellemző
izotóp-
összetétel
(móltört)
természetes
ingadozás
(móltört)
gerjesztési energia
164Ir 77 87 163,99220(44)# 1# ms 2−#
164mIr 270(110)# keV 94(27) µs 9+#
165Ir 77 88 164,98752(23)# <1# µs 1/2+#
165mIr 180(50)# keV 300(60) µs 11/2−
166Ir 77 89 165,98582(22)# 10,5(22) ms (2−)
166mIr 172(6) keV 15,1(9) ms (9+)
167Ir 77 90 166,981665(20) 35,2(20) ms 1/2+
167mIr 175,3(22) keV 30,0(6) ms 11/2−
168Ir 77 91 167,97988(16)# 161(21) ms magas
168mIr 50(100)# keV 125(40) ms alacsony
169Ir 77 92 168,976295(28) 780(360) ms [0,64(+46−24) s] 1/2+#
169mIr 154(24) keV 308(22) ms 11/2−#
170Ir 77 93 169,97497(11)# 910(150) ms [0,87(+18−12) s] alacsony#
170mIr 270(70)# keV 440(60) ms magas#
171Ir 77 94 170,97163(4) 3,6(10) s [3,2(+13−7) s] 1/2+#
171mIr 180(30)# keV 1,40(10) s (11/2−)
172Ir 77 95 171,97046(11)# 4,4(3) s (3+)
172mIr 280(100)# keV 2,0(1) s (7+)
173Ir 77 96 172,967502(15) 9,0(8) s (3/2+,5/2+)
173mIr 253(27) keV 2,20(5) s (11/2−)
174Ir 77 97 173,966861(30) 7,9(6) s (3+)
174mIr 193(11) keV 4,9(3) s (7+)
175Ir 77 98 174,964113(21) 9(2) s (5/2−)
176Ir 77 99 175,963649(22) 8,3(6) s
177Ir 77 100 176,961302(21) 30(2) s 5/2−
178Ir 77 101 177,961082(21) 12(2) s
179Ir 77 102 178,959122(12) 79(1) s (5/2)−
180Ir 77 103 179,959229(23) 1,5(1) perc (4,5)(+#)
181Ir 77 104 180,957625(28) 4,90(15) perc (5/2)−
182Ir 77 105 181,958076(23) 15(1) perc (3+)
183Ir 77 106 182,956846(27) 57(4) perc 5/2−
184Ir 77 107 183,95748(3) 3,09(3) óra 5−
184m1Ir 225,65(11) keV 470(30) µs 3+
184m2Ir 328,40(24) keV 350(90) ns (7)+
185Ir 77 108 184,95670(3) 14,4(1) óra 5/2−
186Ir 77 109 185,957946(18) 16,64(3) óra 5+
186mIr 0,8(4) keV 1,92(5) óra 2−
187Ir 77 110 186,957363(7) 10,5(3) óra 3/2+
187m1Ir 186,15(4) keV 30,3(6) ms 9/2−
187m2Ir 433,81(9) keV 152(12) ns 11/2−
188Ir 77 111 187,958853(8) 41,5(5) óra 1−
188mIr 970(30) keV 4,2(2) ms 7+#
189Ir 77 112 188,958719(14) 13,2(1) nap 3/2+
189m1Ir 372,18(4) keV 13,3(3) ms 11/2−
189m2Ir 2333,3(4) keV 3,7(2) ms (25/2)+
190Ir 77 113 189,9605460(18) 11,78(10) nap 4−
190m1Ir 26,1(1) keV 1,120(3) óra (1−)
190m2Ir 36,154(25) keV >2 µs (4)+
190m3Ir 376,4(1) keV 3,087(12) óra (11)−
191Ir 77 114 190,9605940(18) stabil 3/2+ 0,373(2)
191m1Ir 171,24(5) keV 4,94(3) s 11/2−
191m2Ir 2120(40) keV 5,5(7) s
192Ir 77 115 191,9626050(18) 73,827(13) nap 4+
192m1Ir 56,720(5) keV 1,45(5) perc 1−
192m2Ir 168,14(12) keV 241(9) év (11−)
193Ir 77 116 192,9629264(18) stabil 3/2+ 0,627(2)
193mIr 80,240(6) keV 10,53(4) nap 11/2−
194Ir 77 117 193,9650784(18) 19,28(13) óra 1−
194m1Ir 147,078(5) keV 31,85(24) ms (4+)
194m2Ir 370(70) keV 171(11) nap (10,11)(−#)
195Ir 77 118 194,9659796(18) 2,5(2) óra 3/2+
195mIr 100(5) keV 3,8(2) óra 11/2−
196Ir 77 119 195,96840(4) 52(1) s (0−)
196mIr 210(40) keV 1,40(2) óra (10,11−)
197Ir 77 120 196,969653(22) 5,8(5) perc 3/2+
197mIr 115(5) keV 8,9(3) perc 11/2−
198Ir 77 121 197,97228(21)# 8(1) s
199Ir 77 122 198,97380(4) 20# s 3/2+#

Megjegyzések

  • A # jelölésű értékek nem kizárólag kísérleti adatokból származnak, ezeknél rendszeres tendenciákat is figyelembe vettek. A gyenge asszignációs argumentumú spineket zárójelben jelöltük.
  • A bizonytalanságokat rövid formában – a megfelelő utolsó számjegy után zárójelben – adjuk meg. A bizonytalanság értéke egy standard deviációnak felel meg, leszámítva a IUPAC által megadott izotóp-összetételt és standard atomtömeget, melyeknél kiterjesztett bizonytalanságot használunk.

Hivatkozások

Az ozmium izotópjai Az irídium izotópjai A platina izotópjai
Izotópok listája

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